Big-box Retail companies shares down at 10 a.m.

IndustriesAssociated Press

Shares of some top big-box retail companies are down at 10 a.m.:

Costco Wholesale Corp. fell $.61 or .5 percent, to $116.94.

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Target fell $.17 or .3 percent, to $60.22.

Wal-Mart Stores Inc. fell $.48 or .6 percent, to $75.49.